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Odd Man Out and Series - General Aptitude

Insert the missing number.
Q1:

16, 33, 65, 131, 261, (....)

A 523

B 521

C 613

D 721

ANS:A - 523

Each number is twice the preceding one with 1 added or subtracted alternatively. So, the next number is (2 x 261 + 1) = 523.